All you need is a half circle. I made a circle using a pin. some string and a pencil. Make a circle about 12 inches across. After you make the circle on paper, cut it out. Then fold in half and cut on the fold.
Use the half circle pattern for your fabric. I used two different fabrics for front and back. I found out that if you are using a pattern that has direction like trees make sure to place the pattern on so flat line is up on design.
Cut a front and a back for each napkin. Then right sides together, stitch around them leaving an opening for turning. Turn right side out and then stitch around the outside edge, closing your litle opening as you sew. Voila! A Christmas napkin. I will try and find some pics of ones I did and post.
I also sewed little lines on to know where to fold and this helped keep the two pieces together better.